AbstractSteam shutoff valves are operated under complex loading conditions at thermal and nuclear power stations. In addition to exposure to'/> Investigation into the Cyclic Strength of the Bodies of Steam Shutoff Valves from 10Kh9MFB-Sh Steel
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Investigation into the Cyclic Strength of the Bodies of Steam Shutoff Valves from 10Kh9MFB-Sh Steel

机译：10Kh9MFB-Sh钢制蒸汽截止阀阀体的循环强度研究

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AbstractSteam shutoff valves are operated under complex loading conditions at thermal and nuclear power stations. In addition to exposure to high temperature and stresses resulting in fatigue, these valves are subjected to cyclic loads in heating-up–cooling down, opening–closing, etc. cycles. The number of these cycles to be specified in designing the valves should not exceed the maximum allowable value. Hence, the problem of cyclic failure rate of steam shutoff valve bodies is critical. This paper continues the previous publications about properties of the construction material for steam shutoff valve bodies (grade 10Kh9MFB-Sh steel) produced by electroslag melting and gives the results of investigation into the cyclic strength of this material. Fatigue curves for the steal used for manufacturing steam shutoff valve bodies are presented. The experimental data are compared with the calculated fatigue curves plotted using the procedures outlined in PNAE G-002-986 and RD 10-249-98. It is confirmed that these procedures may be used in designing valve bodies from 10Kh9MFB-Sh steel. The effect of the cyclic damage after preliminary cyclic loading of the specimens according to the prescribed load conditions on the high-temperature strength of the steel is examined. The influence of cyclic failure rate on the long-term strength was investigated using cylindrical specimens with a smooth working section in the as-made conditions and after two regimes of preliminary cyclic loading (training) at a working temperature of 570°C and the number of load cycles exceeding the design value, which was 2 × 103cycles. The experiments corroborated that the material (10Kh9MFB-Sh steel) of the body manufactured by the method of electroslag melting had high resistance to cyclic failure rate. No effect of cyclic damages in the metal of the investigated specimens on the high-temperature strength has been found.
机译： 摘要 蒸汽截止阀在火力和核电站的复杂负荷条件下运行。除了要承受高温和应力导致的疲劳外，这些阀门在加热-冷却，开-关等循环中还要承受周期性的载荷。在设计阀门时要指定的循环次数不应超过最大允许值。因此，蒸汽截止阀体的循环故障率问题是至关重要的。本文延续了以前有关电渣熔化生产的蒸汽截止阀阀体（10Kh9MFB-Sh钢）建筑材料性能的出版物，并给出了对该材料循环强度的研究结果。给出了用于制造蒸汽截止阀阀体的钢的疲劳曲线。将实验数据与使用PNAE G-002-986和RD 10-249-98中概述的程序绘制的计算得出的疲劳曲线进行比较。可以确认，这些程序可用于由10Kh9MFB-Sh钢设计阀体。研究了在按照规定的载荷条件对样品进行初步循环载荷后，循环损伤对钢的高温强度的影响。循环破坏率对长期强度的影响是使用圆柱形试样在既定条件下进行的，并且在570°C的工作温度下的两个初步循环载荷（训练）和工作次数下，采用既定条件下的光滑工作截面来研究超过设计值2×10 3 个周期的载荷周期。实验证实，通过电渣熔炼方法制造的主体材料（10Kh9MFB-Sh钢）具有很高的抗循环破坏率。没有发现被测样品的金属周期性损伤对高温强度的影响。

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